Sounds like this is why John Conyers wants to talk to Pittsburgh US Attorney Mary Beth Buchanan (from WTAE in Pittsburgh) ...

The Justice Department consulted with U.S. Attorney Mary Beth Buchanan in Pittsburgh when it was drawing up a list of prosecutors to be fired, a former top aide to the attorney general told investigators, and now a House committee wants to interview her.

Attorney General Alberto Gonzales' former chief of staff, Kyle Sampson, told Senate investigators Sunday that Buchanan was one of the senior officials he consulted about which U.S. attorneys should be asked to resign, according to a Senate Judiciary Committee aide who read a transcript of the interview. The aide requested anonymity because of the sensitivity of the issue.